ash: initial addition, Boundary Devices Board

ash: add poweroff command
ash: fix some input gpios(CH_ON_RBL/SG_ON_RBL/DOOR_CLOSED
ash: use nitrogen6x/clock.cfg
ash: use nitrogen6x ddr-setup.cfg
ash: remove micrel phy references(only atheros on this board)
ash: add CONFIG_CMD_GPIO
ash: set rgb_gpio_pads
ash: TP86 becomes lvds backlight enable
ash: explicit fbp_detect_i2c
ash: default uart1 to rs232
ash: use 800mhz for memory
ash: use boundary.h
ash: GP_BSL_CB_ON_OFF high, TX23D200_18 default dispay
ash: add CONFIG_VIDEO_SKIP_VERSION
ash: GP_BSL_CB_ON_OFF default to low again
ash: add EIM_EB2 for sd card power control
ash: add CONFIG_SPI_FLASH_SPANSION
ash: ash_defconfig add CONFIG_BLOCK_CACHE
ash: use common code for eth init
ash: eth.c now in common directory
ash: move misc_init_r/do_kbd to common
ash: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
ash: gpio3 is power off, don't redefine
ash: add power_init_board because mdelay cannot be used in board_early_init_f
ash: use common 800mhz_4x128mx16.cfg
ash: rgb24 vs rgb66 panel have different backlight active levels
ash: fixup dtb backlight levels
ash: add  CONFIG_SPI_FLASH_GIGADEVICE: to defconfigs
ash: use common ddr script
ash: port to v2018.07

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

ash: update to v2017.01
ash: update to v2017.03

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>